src/rowpainter.C

   1 /**
   2  * \file rowpainter.C
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author various
   7  * \author John Levon
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "rowpainter.h"
  15
  16 #include "buffer.h"
  17 #include "coordcache.h"
  18 #include "cursor.h"
  19 #include "debug.h"
  20 #include "bufferparams.h"
  21 #include "BufferView.h"
  22 #include "encoding.h"
  23 #include "gettext.h"
  24 #include "language.h"
  25 #include "LColor.h"
  26 #include "lyxrc.h"
  27 #include "lyxrow.h"
  28 #include "lyxrow_funcs.h"
  29 #include "metricsinfo.h"
  30 #include "paragraph.h"
  31 #include "paragraph_funcs.h"
  32 #include "ParagraphParameters.h"
  33 #include "vspace.h"
  34
  35 #include "frontends/font_metrics.h"
  36 #include "frontends/nullpainter.h"
  37 #include "frontends/Painter.h"
  38
  39 #include "insets/insettext.h"
  40
  41 #include "support/textutils.h"
  42
  43 #include <boost/crc.hpp>
  44
  45 using lyx::pos_type;
  46 using lyx::pit_type;
  47
  48 using std::endl;
  49 using std::max;
  50 using std::min;
  51 using std::string;
  52
  53
  54 namespace {
  55
  56 /**
  57  * A class used for painting an individual row of text.
  58  */
  59 class RowPainter {
  60 public:
  61         /// initialise and run painter
  62         RowPainter(PainterInfo & pi, LyXText const & text,
  63                 pit_type pit, Row const & row, int x, int y);
  64
  65         // paint various parts
  66         void paintAppendix();
  67         void paintDepthBar();
  68         void paintChangeBar();
  69         void paintFirst();
  70         void paintLast();
  71         void paintText();
  72
  73 private:
  74         void paintForeignMark(double orig_x, LyXFont const & font, int desc = 0);
  75         void paintHebrewComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  76         void paintArabicComposeChar(lyx::pos_type & vpos, LyXFont const & font);
  77         void paintChars(lyx::pos_type & vpos, LyXFont font,
  78                         bool hebrew, bool arabic);
  79         int paintAppendixStart(int y);
  80         void paintFromPos(lyx::pos_type & vpos);
  81         void paintInset(lyx::pos_type const pos, LyXFont const & font);
  82
  83         /// return left margin
  84         int leftMargin() const;
  85
  86         /// return the label font for this row
  87         LyXFont const getLabelFont() const;
  88
  89         /// bufferview to paint on
  90         BufferView const & bv_;
  91
  92         /// Painter to use
  93         Painter & pain_;
  94
  95         /// LyXText for the row
  96         LyXText const & text_;
  97         ParagraphList const & pars_;
  98
  99         /// The row to paint
 100         Row const & row_;
 101
 102         /// Row's paragraph
 103         pit_type const pit_;
 104         Paragraph const & par_;
 105
 106         /// is row erased? (change tracking)
 107         bool erased_;
 108
 109         // Looks ugly - is
 110         double const xo_;
 111         int const yo_;    // current baseline
 112         double x_;
 113         int width_;
 114         double separator_;
 115         double hfill_;
 116         double label_hfill_;
 117 };
 118
 119
 120 RowPainter::RowPainter(PainterInfo & pi,
 121         LyXText const & text, pit_type pit, Row const & row, int x, int y)
 122         : bv_(*pi.base.bv), pain_(pi.pain), text_(text), pars_(text.paragraphs()),
 123           row_(row), pit_(pit), par_(text.paragraphs()[pit]),
 124           erased_(pi.erased_),
 125           xo_(x), yo_(y), width_(text_.width())
 126 {
 127         RowMetrics m = text_.computeRowMetrics(pit, row_);
 128         x_ = m.x + xo_;
 129
 130         //lyxerr << "RowPainter: x: " << x_ << " xo: " << xo_ << " yo: " << yo_ << endl;
 131         //row_.dump();
 132
 133         separator_ = m.separator;
 134         hfill_ = m.hfill;
 135         label_hfill_ = m.label_hfill;
 136
 137         BOOST_ASSERT(pit >= 0);
 138         BOOST_ASSERT(pit < int(text.paragraphs().size()));
 139 }
 140
 141
 142 LyXFont const RowPainter::getLabelFont() const
 143 {
 144         return text_.getLabelFont(par_);
 145 }
 146
 147
 148 int RowPainter::leftMargin() const
 149 {
 150         return text_.leftMargin(pit_, row_.pos());
 151 }
 152
 153
 154 bool isTrueTextInset(InsetBase * in)
 155 {
 156         // Math and tabular insets have isTextInset = true, though they are
 157         // not derived from InsetText. Paint them fully
 158         return (in && in->isTextInset() && in->asMathInset() == 0
 159                 && in->lyxCode() != InsetBase::TABULAR_CODE);
 160 }
 161
 162
 163 void RowPainter::paintInset(pos_type const pos, LyXFont const & font)
 164 {
 165         InsetBase const * inset = par_.getInset(pos);
 166         BOOST_ASSERT(inset);
 167         PainterInfo pi(const_cast<BufferView *>(&bv_), pain_);
 168         // FIXME: We should always use font, see documentation of
 169         // noFontChange() in insetbase.h.
 170         pi.base.font = inset->noFontChange() ?
 171                 bv_.buffer()->params().getFont() :
 172                 font;
 173         pi.ltr_pos = (text_.bidi.level(pos) % 2 == 0);
 174         pi.erased_ = erased_ || isDeletedText(par_, pos);
 175         theCoords.insets().add(inset, int(x_), yo_);
 176         InsetBase * in = const_cast<InsetBase *>(inset);
 177         // non-wide insets are painted completely. Recursive
 178         bool tmp = bv_.repaintAll();
 179         if (!isTrueTextInset(in) || !static_cast<InsetText*>(in)->Wide())
 180                 bv_.repaintAll(true);
 181         if (bv_.repaintAll())
 182                 inset->drawSelection(pi, int(x_), yo_);
 183         inset->draw(pi, int(x_), yo_);
 184         bv_.repaintAll(tmp);
 185         x_ += inset->width();
 186 }
 187
 188
 189 void RowPainter::paintHebrewComposeChar(pos_type & vpos, LyXFont const & font)
 190 {
 191         pos_type pos = text_.bidi.vis2log(vpos);
 192
 193         string str;
 194
 195         // first char
 196         char c = par_.getChar(pos);
 197         str += c;
 198         ++vpos;
 199
 200         int const width = font_metrics::width(c, font);
 201         int dx = 0;
 202
 203         for (pos_type i = pos - 1; i >= 0; --i) {
 204                 c = par_.getChar(i);
 205                 if (!Encodings::IsComposeChar_hebrew(c)) {
 206                         if (IsPrintableNonspace(c)) {
 207                                 int const width2 =
 208                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 209                                 // dalet / resh
 210                                 dx = (c == 'ø' || c == 'ã')
 211                                         ? width2 - width
 212                                         : (width2 - width) / 2;
 213                         }
 214                         break;
 215                 }
 216         }
 217
 218         // Draw nikud
 219         pain_.text(int(x_) + dx, yo_, str, font);
 220 }
 221
 222
 223 void RowPainter::paintArabicComposeChar(pos_type & vpos, LyXFont const & font)
 224 {
 225         pos_type pos = text_.bidi.vis2log(vpos);
 226         string str;
 227
 228         // first char
 229         char c = par_.getChar(pos);
 230         c = par_.transformChar(c, pos);
 231         str += c;
 232         ++vpos;
 233
 234         int const width = font_metrics::width(c, font);
 235         int dx = 0;
 236
 237         for (pos_type i = pos - 1; i >= 0; --i) {
 238                 c = par_.getChar(i);
 239                 if (!Encodings::IsComposeChar_arabic(c)) {
 240                         if (IsPrintableNonspace(c)) {
 241                                 int const width2 =
 242                                         text_.singleWidth(par_, i, c, text_.getFont(par_, i));
 243                                 dx = (width2 - width) / 2;
 244                         }
 245                         break;
 246                 }
 247         }
 248         // Draw nikud
 249         pain_.text(int(x_) + dx, yo_, str, font);
 250 }
 251
 252
 253 void RowPainter::paintChars(pos_type & vpos, LyXFont font,
 254                             bool hebrew, bool arabic)
 255 {
 256         pos_type pos = text_.bidi.vis2log(vpos);
 257         pos_type const end = row_.endpos();
 258         FontSpan const font_span = par_.fontSpan(pos);
 259         Change::Type const prev_change = par_.lookupChange(pos);
 260
 261         // first character
 262         string str;
 263         str += par_.getChar(pos);
 264         if (arabic) {
 265                 unsigned char c = str[0];
 266                 str[0] = par_.transformChar(c, pos);
 267         }
 268
 269         // collect as much similar chars as we can
 270         for (++vpos ; vpos < end ; ++vpos) {
 271                 pos = text_.bidi.vis2log(vpos);
 272                 if (pos < font_span.first || pos > font_span.last)
 273                         break;
 274
 275                 if (prev_change != par_.lookupChange(pos))
 276                         break;
 277
 278                 char c = par_.getChar(pos);
 279
 280                 if (!IsPrintableNonspace(c))
 281                         break;
 282
 283                 if (arabic && Encodings::IsComposeChar_arabic(c))
 284                         break;
 285
 286                 if (hebrew && Encodings::IsComposeChar_hebrew(c))
 287                         break;
 288
 289                 if (arabic)
 290                         c = par_.transformChar(c, pos);
 291
 292                 str += c;
 293         }
 294
 295         if (prev_change == Change::DELETED)
 296                 font.setColor(LColor::strikeout);
 297         else if (prev_change == Change::INSERTED)
 298                 font.setColor(LColor::newtext);
 299
 300         // Draw text and set the new x position
 301         //lyxerr << "paint row: yo_ " << yo_ << "\n";
 302         pain_.text(int(x_), yo_, str, font);
 303         x_ += font_metrics::width(str, font);
 304 }
 305
 306
 307 void RowPainter::paintForeignMark(double orig_x, LyXFont const & font, int desc)
 308 {
 309         if (!lyxrc.mark_foreign_language)
 310                 return;
 311         if (font.language() == latex_language)
 312                 return;
 313         if (font.language() == bv_.buffer()->params().language)
 314                 return;
 315
 316         int const y = yo_ + 1 + desc;
 317         pain_.line(int(orig_x), y, int(x_), y, LColor::language);
 318 }
 319
 320
 321 void RowPainter::paintFromPos(pos_type & vpos)
 322 {
 323         pos_type const pos = text_.bidi.vis2log(vpos);
 324         LyXFont orig_font = text_.getFont(par_, pos);
 325
 326         double const orig_x = x_;
 327
 328         if (par_.isInset(pos)) {
 329                 paintInset(pos, orig_font);
 330                 ++vpos;
 331                 paintForeignMark(orig_x, orig_font,
 332                         par_.getInset(pos)->descent());
 333                 return;
 334         }
 335
 336         // usual characters, no insets
 337         char const c = par_.getChar(pos);
 338
 339         // special case languages
 340         std::string const & lang = orig_font.language()->lang();
 341         bool const hebrew = lang == "hebrew";
 342         bool const arabic = lang == "arabic" &&
 343                 (lyxrc.font_norm_type == LyXRC::ISO_8859_6_8 ||
 344                 lyxrc.font_norm_type == LyXRC::ISO_10646_1);
 345
 346         // draw as many chars as we can
 347         if ((!hebrew && !arabic)
 348                 || (hebrew && !Encodings::IsComposeChar_hebrew(c))
 349                 || (arabic && !Encodings::IsComposeChar_arabic(c))) {
 350                 paintChars(vpos, orig_font, hebrew, arabic);
 351         } else if (hebrew) {
 352                 paintHebrewComposeChar(vpos, orig_font);
 353         } else if (arabic) {
 354                 paintArabicComposeChar(vpos, orig_font);
 355         }
 356
 357         paintForeignMark(orig_x, orig_font);
 358 }
 359
 360
 361 void RowPainter::paintChangeBar()
 362 {
 363         pos_type const start = row_.pos();
 364         pos_type const end = row_.endpos();
 365
 366         if (start == end || !par_.isChanged(start, end - 1))
 367                 return;
 368
 369         int const height = text_.isLastRow(pit_, row_)
 370                 ? row_.ascent()
 371                 : row_.height();
 372
 373         pain_.fillRectangle(4, yo_ - row_.ascent(), 5, height, LColor::changebar);
 374 }
 375
 376
 377 void RowPainter::paintAppendix()
 378 {
 379         if (!par_.params().appendix())
 380                 return;
 381
 382         int y = yo_ - row_.ascent();
 383
 384         if (par_.params().startOfAppendix())
 385                 y += 2 * defaultRowHeight();
 386
 387         pain_.line(1, y, 1, yo_ + row_.height(), LColor::appendix);
 388         pain_.line(width_ - 2, y, width_ - 2, yo_ + row_.height(), LColor::appendix);
 389 }
 390
 391
 392 void RowPainter::paintDepthBar()
 393 {
 394         Paragraph::depth_type const depth = par_.getDepth();
 395
 396         if (depth <= 0)
 397                 return;
 398
 399         Paragraph::depth_type prev_depth = 0;
 400         if (!text_.isFirstRow(pit_, row_)) {
 401                 pit_type pit2 = pit_;
 402                 if (row_.pos() == 0)
 403                         --pit2;
 404                 prev_depth = pars_[pit2].getDepth();
 405         }
 406
 407         Paragraph::depth_type next_depth = 0;
 408         if (!text_.isLastRow(pit_, row_)) {
 409                 pit_type pit2 = pit_;
 410                 if (row_.endpos() >= pars_[pit2].size())
 411                         ++pit2;
 412                 next_depth = pars_[pit2].getDepth();
 413         }
 414
 415         for (Paragraph::depth_type i = 1; i <= depth; ++i) {
 416                 int const w = nestMargin() / 5;
 417                 int x = int(xo_) + w * i;
 418                 // only consider the changebar space if we're drawing outermost text
 419                 if (text_.isMainText())
 420                         x += changebarMargin();
 421
 422                 int const starty = yo_ - row_.ascent();
 423                 int const h =  row_.height() - 1 - (i - next_depth - 1) * 3;
 424
 425                 pain_.line(x, starty, x, starty + h, LColor::depthbar);
 426
 427                 if (i > prev_depth)
 428                         pain_.fillRectangle(x, starty, w, 2, LColor::depthbar);
 429                 if (i > next_depth)
 430                         pain_.fillRectangle(x, starty + h, w, 2, LColor::depthbar);
 431         }
 432 }
 433
 434
 435 int RowPainter::paintAppendixStart(int y)
 436 {
 437         LyXFont pb_font;
 438         pb_font.setColor(LColor::appendix);
 439         pb_font.decSize();
 440
 441         string const label = _("Appendix");
 442         int w = 0;
 443         int a = 0;
 444         int d = 0;
 445         font_metrics::rectText(label, pb_font, w, a, d);
 446
 447         int const text_start = int(xo_ + (width_ - w) / 2);
 448         int const text_end = text_start + w;
 449
 450         pain_.rectText(text_start, y + d, label, pb_font, LColor::none, LColor::none);
 451
 452         pain_.line(int(xo_ + 1), y, text_start, y, LColor::appendix);
 453         pain_.line(text_end, y, int(xo_ + width_ - 2), y, LColor::appendix);
 454
 455         return 3 * defaultRowHeight();
 456 }
 457
 458
 459 void RowPainter::paintFirst()
 460 {
 461         ParagraphParameters const & parparams = par_.params();
 462
 463         int y_top = 0;
 464
 465         // start of appendix?
 466         if (parparams.startOfAppendix())
 467                 y_top += paintAppendixStart(yo_ - row_.ascent() + 2 * defaultRowHeight());
 468
 469         Buffer const & buffer = *bv_.buffer();
 470
 471         LyXLayout_ptr const & layout = par_.layout();
 472
 473         if (buffer.params().paragraph_separation == BufferParams::PARSEP_SKIP) {
 474                 if (pit_ != 0) {
 475                         if (layout->latextype == LATEX_PARAGRAPH
 476                                 && !par_.getDepth()) {
 477                                 y_top += buffer.params().getDefSkip().inPixels(bv_);
 478                         } else {
 479                                 LyXLayout_ptr const & playout = pars_[pit_ - 1].layout();
 480                                 if (playout->latextype == LATEX_PARAGRAPH
 481                                         && !pars_[pit_ - 1].getDepth()) {
 482                                         // is it right to use defskip here, too? (AS)
 483                                         y_top += buffer.params().getDefSkip().inPixels(bv_);
 484                                 }
 485                         }
 486                 }
 487         }
 488
 489         bool const is_rtl = text_.isRTL(par_);
 490         bool const is_seq = isFirstInSequence(pit_, text_.paragraphs());
 491         //lyxerr << "paintFirst: " << par_.id() << " is_seq: " << is_seq << std::endl;
 492
 493         // should we print a label?
 494         if (layout->labeltype >= LABEL_STATIC
 495             && (layout->labeltype != LABEL_STATIC
 496                       || layout->latextype != LATEX_ENVIRONMENT
 497                       || is_seq)) {
 498
 499                 LyXFont const font = getLabelFont();
 500                 string const str = par_.getLabelstring();
 501                 if (!str.empty()) {
 502                         double x = x_;
 503
 504                         // this is special code for the chapter layout. This is
 505                         // printed in an extra row and has a pagebreak at
 506                         // the top.
 507                         if (layout->counter == "chapter") {
 508                                 double spacing_val = 1.0;
 509                                 if (!parparams.spacing().isDefault()) {
 510                                         spacing_val = parparams.spacing().getValue();
 511                                 } else {
 512                                         spacing_val = buffer.params().spacing().getValue();
 513                                 }
 514
 515                                 int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 516
 517                                 int const maxdesc = int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val)
 518                                         + int(layout->parsep) * defaultRowHeight();
 519
 520                                 if (is_rtl) {
 521                                         x = width_ - leftMargin() -
 522                                                 font_metrics::width(str, font);
 523                                 }
 524
 525                                 pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 526                         } else {
 527                                 if (is_rtl) {
 528                                         x = width_ - leftMargin()
 529                                                 + font_metrics::width(layout->labelsep, font);
 530                                 } else {
 531                                         x = x_ - font_metrics::width(layout->labelsep, font)
 532                                                 - font_metrics::width(str, font);
 533                                 }
 534
 535                                 pain_.text(int(x), yo_, str, font);
 536                         }
 537                 }
 538
 539         // the labels at the top of an environment.
 540         // More or less for bibliography
 541         } else if (is_seq &&
 542                 (layout->labeltype == LABEL_TOP_ENVIRONMENT ||
 543                 layout->labeltype == LABEL_BIBLIO ||
 544                 layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT)) {
 545                 LyXFont font = getLabelFont();
 546                 if (!par_.getLabelstring().empty()) {
 547                         string const str = par_.getLabelstring();
 548                         double spacing_val = 1.0;
 549                         if (!parparams.spacing().isDefault())
 550                                 spacing_val = parparams.spacing().getValue();
 551                         else
 552                                 spacing_val = buffer.params().spacing().getValue();
 553
 554                         int const labeladdon = int(font_metrics::maxHeight(font) * layout->spacing.getValue() * spacing_val);
 555
 556                         int maxdesc =
 557                                 int(font_metrics::maxDescent(font) * layout->spacing.getValue() * spacing_val
 558                                 + (layout->labelbottomsep * defaultRowHeight()));
 559
 560                         double x = x_;
 561                         if (layout->labeltype == LABEL_CENTERED_TOP_ENVIRONMENT) {
 562                                 if (is_rtl)
 563                                         x = leftMargin();
 564                                 x += (width_ - text_.rightMargin(par_) - leftMargin()) / 2;
 565                                 x -= font_metrics::width(str, font) / 2;
 566                         } else if (is_rtl) {
 567                                 x = width_ - leftMargin() -
 568                                         font_metrics::width(str, font);
 569                         }
 570                         pain_.text(int(x), yo_ - maxdesc - labeladdon, str, font);
 571                 }
 572         }
 573 }
 574
 575
 576 void RowPainter::paintLast()
 577 {
 578         bool const is_rtl = text_.isRTL(par_);
 579         int const endlabel = getEndLabel(pit_, text_.paragraphs());
 580
 581         // draw an endlabel
 582         switch (endlabel) {
 583         case END_LABEL_BOX:
 584         case END_LABEL_FILLED_BOX: {
 585                 LyXFont const font = getLabelFont();
 586                 int const size = int(0.75 * font_metrics::maxAscent(font));
 587                 int const y = yo_ - size;
 588                 int x = is_rtl ? nestMargin() + changebarMargin() : width_ - size;
 589
 590                 if (width_ - int(row_.width()) <= size)
 591                         x += (size - width_ + row_.width() + 1) * (is_rtl ? -1 : 1);
 592
 593                 if (endlabel == END_LABEL_BOX)
 594                         pain_.rectangle(x, y, size, size, LColor::eolmarker);
 595                 else
 596                         pain_.fillRectangle(x, y, size, size, LColor::eolmarker);
 597                 break;
 598         }
 599
 600         case END_LABEL_STATIC: {
 601                 LyXFont font = getLabelFont();
 602                 string const & str = par_.layout()->endlabelstring();
 603                 double const x = is_rtl ?
 604                         x_ - font_metrics::width(str, font)
 605                         : - text_.rightMargin(par_) - row_.width();
 606                 pain_.text(int(x), yo_, str, font);
 607                 break;
 608         }
 609
 610         case END_LABEL_NO_LABEL:
 611                 break;
 612         }
 613 }
 614
 615
 616 void RowPainter::paintText()
 617 {
 618         pos_type const end = row_.endpos();
 619         pos_type body_pos = par_.beginOfBody();
 620         if (body_pos > 0 &&
 621                 (body_pos > end || !par_.isLineSeparator(body_pos - 1))) {
 622                 body_pos = 0;
 623         }
 624
 625         LyXLayout_ptr const & layout = par_.layout();
 626
 627         bool running_strikeout = false;
 628         bool is_struckout = false;
 629         int last_strikeout_x = 0;
 630
 631         // Use font span to speed things up, see below
 632         FontSpan font_span;
 633         LyXFont font;
 634
 635         for (pos_type vpos = row_.pos(); vpos < end; ) {
 636                 if (x_ > bv_.workWidth())
 637                         break;
 638
 639                 pos_type const pos = text_.bidi.vis2log(vpos);
 640
 641                 if (pos >= par_.size()) {
 642                         ++vpos;
 643                         continue;
 644                 }
 645
 646                 // Use font span to speed things up, see above
 647                 if (vpos < font_span.first || vpos > font_span.last) {
 648                         font_span = par_.fontSpan(vpos);
 649                         font = text_.getFont(par_, vpos);
 650                 }
 651
 652                 const int width_pos =
 653                         text_.singleWidth(par_, pos, par_.getChar(pos), font);
 654
 655                 if (x_ + width_pos < 0) {
 656                         x_ += width_pos;
 657                         ++vpos;
 658                         continue;
 659                 }
 660
 661                 is_struckout = isDeletedText(par_, pos);
 662
 663                 if (is_struckout && !running_strikeout) {
 664                         running_strikeout = true;
 665                         last_strikeout_x = int(x_);
 666                 }
 667
 668                 bool const highly_editable_inset = par_.isInset(pos)
 669                         && isHighlyEditableInset(par_.getInset(pos));
 670
 671                 // If we reach the end of a struck out range, paint it.
 672                 // We also don't paint across things like tables
 673                 if (running_strikeout && (highly_editable_inset || !is_struckout)) {
 674                         // Calculate 1/3 height of the buffer's default font
 675                         int const middle =
 676                                 yo_ -
 677                                 font_metrics::maxAscent(bv_.buffer()->params().getFont()) / 3;
 678                         pain_.line(last_strikeout_x, middle, int(x_), middle,
 679                                 LColor::strikeout, Painter::line_solid, Painter::line_thin);
 680                         running_strikeout = false;
 681                 }
 682
 683                 if (body_pos > 0 && pos == body_pos - 1) {
 684                         int const lwidth = font_metrics::width(layout->labelsep,
 685                                 getLabelFont());
 686
 687                         x_ += label_hfill_ + lwidth - width_pos;
 688                 }
 689
 690                 if (par_.isHfill(pos)) {
 691                         x_ += 1;
 692
 693                         int const y0 = yo_;
 694                         int const y1 = y0 - defaultRowHeight() / 2;
 695
 696                         pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 697
 698                         if (hfillExpansion(par_, row_, pos)) {
 699                                 int const y2 = (y0 + y1) / 2;
 700
 701                                 if (pos >= body_pos) {
 702                                         pain_.line(int(x_), y2, int(x_ + hfill_), y2,
 703                                                   LColor::added_space,
 704                                                   Painter::line_onoffdash);
 705                                         x_ += hfill_;
 706                                 } else {
 707                                         pain_.line(int(x_), y2, int(x_ + label_hfill_), y2,
 708                                                   LColor::added_space,
 709                                                   Painter::line_onoffdash);
 710                                         x_ += label_hfill_;
 711                                 }
 712                                 pain_.line(int(x_), y1, int(x_), y0, LColor::added_space);
 713                         }
 714                         x_ += 2;
 715                         ++vpos;
 716                 } else if (par_.isSeparator(pos)) {
 717                         x_ += width_pos;
 718                         if (pos >= body_pos)
 719                                 x_ += separator_;
 720                         ++vpos;
 721                 } else {
 722                         paintFromPos(vpos);
 723                 }
 724         }
 725
 726         // if we reach the end of a struck out range, paint it
 727         if (running_strikeout) {
 728                 // calculate 1/3 height of the buffer's default font
 729                 int const middle =
 730                         yo_ -
 731                         font_metrics::maxAscent(bv_.buffer()->params().getFont()) / 3;
 732                 pain_.line(last_strikeout_x, middle, int(x_), middle,
 733                         LColor::strikeout, Painter::line_solid, Painter::line_thin);
 734                 running_strikeout = false;
 735         }
 736 }
 737
 738
 739 lyx::size_type calculateRowSignature(Row const & row, Paragraph const & par,
 740         int x, int y)
 741 {
 742         boost::crc_32_type crc;
 743         for (lyx::pos_type i = row.pos(); i < row.endpos(); ++i) {
 744                 const unsigned char b[] = { par.getChar(i) };
 745                 crc.process_bytes(b, 1);
 746         }
 747         const unsigned char b[] = { x, y, row.width() };
 748         crc.process_bytes(b, 3);
 749         return crc.checksum();
 750 }
 751
 752
 753 bool CursorOnRow(PainterInfo & pi, pit_type const pit,
 754         RowList::const_iterator rit, LyXText const & text)
 755 {
 756         // Is there a cursor on this row (or inside inset on row)
 757         LCursor & cur = pi.base.bv->cursor();
 758         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 759                 CursorSlice const & sl = cur[d];
 760                 if (sl.text() == &text
 761                     && sl.pit() == pit
 762                     && sl.pos() >= rit->pos()
 763                     && sl.pos() < rit->endpos())
 764                         return true;
 765         }
 766         return false;
 767 }
 768
 769
 770 bool innerCursorOnRow(PainterInfo & pi, pit_type pit,
 771         RowList::const_iterator rit, LyXText const & text)
 772 {
 773         // Is there a cursor inside an inset on this row, and is this inset
 774         // the only "character" on this row
 775         LCursor & cur = pi.base.bv->cursor();
 776         if (rit->pos() + 1 != rit->endpos())
 777                 return false;
 778         for (lyx::size_type d = 0; d < cur.depth(); d++) {
 779                 CursorSlice const & sl = cur[d];
 780                 if (sl.text() == &text
 781                     && sl.pit() == pit
 782                     && sl.pos() == rit->pos())
 783                         return d < cur.depth() - 1;
 784         }
 785         return false;
 786 }
 787
 788
 789 void paintPar
 790         (PainterInfo & pi, LyXText const & text, pit_type pit, int x, int y,
 791          bool repaintAll)
 792 {
 793 //      lyxerr << "  paintPar: pit: " << pit << " at y: " << y << endl;
 794         static NullPainter nop;
 795         static PainterInfo nullpi(pi.base.bv, nop);
 796         int const ww = pi.base.bv->workHeight();
 797
 798         Paragraph const & par = text.paragraphs()[pit];
 799
 800         RowList::const_iterator const rb = par.rows().begin();
 801         RowList::const_iterator const re = par.rows().end();
 802         theCoords.parPos()[&text][pit] = Point(x, y);
 803
 804         y -= rb->ascent();
 805         lyx::size_type rowno(0);
 806         for (RowList::const_iterator rit = rb; rit != re; ++rit, ++rowno) {
 807                 y += rit->ascent();
 808                 // Allow setting of bv->repaintAll() for nested insets in
 809                 // this row only
 810                 bool tmp = pi.base.bv->repaintAll();
 811
 812                 // Row signature; has row changed since last paint?
 813                 lyx::size_type const row_sig = calculateRowSignature(*rit, par, x, y);
 814                 bool row_has_changed = par.rowSignature()[rowno] != row_sig;
 815
 816                 bool cursor_on_row = CursorOnRow(pi, pit, rit, text);
 817                 bool in_inset_alone_on_row = innerCursorOnRow(pi, pit, rit,
 818                         text);
 819
 820                 // If this is the only object on the row, we can make it wide
 821                 for (pos_type i = rit->pos() ; i != rit->endpos(); ++i) {
 822                         InsetBase* in
 823                             = const_cast<InsetBase*>(par.getInset(i));
 824                         if (isTrueTextInset(in))
 825                                 static_cast<InsetText*>(in)->Wide()
 826                                     = in_inset_alone_on_row;
 827                 }
 828
 829                 // If selection is on, the current row signature differs
 830                 // from cache, or cursor is inside an inset _on this row_,
 831                 // then paint the row
 832                 if (repaintAll || row_has_changed || cursor_on_row) {
 833                         // Add to row signature cache
 834                         par.rowSignature()[rowno] = row_sig;
 835
 836                         bool const inside = (y + rit->descent() >= 0
 837                                        && y - rit->ascent() < ww);
 838                         RowPainter rp(inside ? pi : nullpi, text, pit, *rit, x, y);
 839                         // Clear background of this row
 840                         // (if paragraph background was not cleared)
 841                         if (!repaintAll &&
 842                             (!in_inset_alone_on_row || row_has_changed)) {
 843                                 pi.pain.fillRectangle(( rowno ? 0 : x - 10 ), y - rit->ascent(),
 844                                     pi.base.bv->workWidth(), rit->height(),
 845                                     text.backgroundColor());
 846                                 // If outer row has changed, force nested
 847                                 // insets to repaint completely
 848                                 if (row_has_changed)
 849                                         pi.base.bv->repaintAll(true);
 850                         }
 851
 852                         // Instrumentation for testing row cache (see also
 853                         // 12 lines lower):
 854                         if (text.isMainText())
 855                                 lyxerr[Debug::PAINTING] << "#";
 856                         else
 857                                 lyxerr[Debug::PAINTING] << "[" <<
 858                                     repaintAll << row_has_changed <<
 859                                     cursor_on_row << "]";
 860                         rp.paintAppendix();
 861                         rp.paintDepthBar();
 862                         rp.paintChangeBar();
 863                         if (rit == rb)
 864                                 rp.paintFirst();
 865                         if (rit + 1 == re)
 866                                 rp.paintLast();
 867                         rp.paintText();
 868                 }
 869                 y += rit->descent();
 870                 // Restore, see above
 871                 pi.base.bv->repaintAll(tmp);
 872         }
 873         lyxerr[Debug::PAINTING] << "." << endl;
 874 }
 875
 876 } // namespace anon
 877
 878
 879 void paintText(BufferView const & bv, ViewMetricsInfo const & vi)
 880 {
 881         Painter & pain = bv.painter();
 882         LyXText * const text = bv.text();
 883         bool const select = bv.cursor().selection();
 884
 885         PainterInfo pi(const_cast<BufferView *>(&bv), pain);
 886         // Should the whole screen, including insets, be refreshed?
 887         bool repaintAll(select || !vi.singlepar);
 888
 889         if (repaintAll) {
 890                 // Clear background (if not delegated to rows)
 891                 pain.fillRectangle(0, vi.y1, bv.workWidth(), vi.y2 - vi.y1,
 892                         text->backgroundColor());
 893         }
 894         if (select) {
 895                 text->drawSelection(pi, 0, 0);
 896         }
 897
 898         int yy = vi.y1;
 899         // draw contents
 900         for (pit_type pit = vi.p1; pit <= vi.p2; ++pit) {
 901                 bv.repaintAll(repaintAll);
 902                 Paragraph const & par = text->getPar(pit);
 903                 yy += par.ascent();
 904                 paintPar(pi, *bv.text(), pit, 0, yy, repaintAll);
 905                 yy += par.descent();
 906         }
 907
 908         // Cache one paragraph above and one below
 909         // Note MV: this cannot be suppressed even for singlepar.
 910         // Try viewing the User Guide Mobius figure
 911
 912         if (vi.p1 > 0) {
 913                 text->redoParagraph(vi.p1 - 1);
 914                 theCoords.parPos()[bv.text()][vi.p1 - 1] =
 915                         Point(0, vi.y1 - text->getPar(vi.p1 - 1).descent());
 916         }
 917
 918         if (vi.p2 < lyx::pit_type(text->paragraphs().size()) - 1) {
 919                 text->redoParagraph(vi.p2 + 1);
 920                 theCoords.parPos()[bv.text()][vi.p2 + 1] =
 921                         Point(0, vi.y2 + text->getPar(vi.p2 + 1).ascent());
 922         }
 923
 924         // and grey out above (should not happen later)
 925 //      lyxerr << "par ascent: " << text->getPar(vi.p1).ascent() << endl;
 926         if (vi.y1 > 0 && !vi.singlepar)
 927                 pain.fillRectangle(0, 0, bv.workWidth(), vi.y1, LColor::bottomarea);
 928
 929         // and possibly grey out below
 930 //      lyxerr << "par descent: " << text->getPar(vi.p1).ascent() << endl;
 931         if (vi.y2 < bv.workHeight() && !vi.singlepar)
 932                 pain.fillRectangle(0, vi.y2, bv.workWidth(), bv.workHeight() - vi.y2, LColor::bottomarea);
 933 }
 934
 935
 936 void paintTextInset(LyXText const & text, PainterInfo & pi, int x, int y)
 937 {
 938 //      lyxerr << "  paintTextInset: y: " << y << endl;
 939
 940         y -= text.getPar(0).ascent();
 941         // This flag can not be set from within same inset:
 942         bool repaintAll = pi.base.bv->repaintAll();
 943         for (int pit = 0; pit < int(text.paragraphs().size()); ++pit) {
 944                 y += text.getPar(pit).ascent();
 945                 paintPar(pi, text, pit, x, y, repaintAll);
 946                 y += text.getPar(pit).descent();
 947         }
 948 }